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Q.

A complex in which central atom carries zero oxidation state is

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a

PtCl4.2NH3

b

[Co (NH3)3Cl3]

c

Ni(CO)4

d

Na2[(Ni(CN)4)]

answer is C.

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Detailed Solution

The oxidation state of Ni in Ni(CO)4 will be 0 because the total charge on Ni(CO)4 is 0.
Assume that Ni is in the oxidation state x.
As CO is in its zeroth stage of oxidation
x + (4 x 0)=0
x = 0
Therefore, the Ni(CO)4 have zero oxidation

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A complex in which central atom carries zero oxidation state is